How do you re-render a FlatList?

By using extraData property on the FlatList component.

 <FlatList
	data={data }
	style={FlatListstyles}
	extraData={this.state}
	renderItem={this._renderItem}
/>

By passing extraData={this.state} to FlatList we make sure FlatList will re-render itself when the state.selected changes. Without setting this prop, FlatList would not know it needs to re-render any items because it is also a PureComponent and the prop comparison will not show any changes.